#!/bin/sh

set -e

program_name=$(basename $0)

if [ -e /etc/default/noosfero ]; then
  . /etc/default/noosfero
else
  NOOSFERO_DIR=$(readlink -f `dirname $0`/..)
fi

# data
available_plugins_dir="$NOOSFERO_DIR/plugins"
enabled_plugins_dir="$NOOSFERO_DIR/config/plugins"
available_plugins=$(find "$available_plugins_dir" -maxdepth 1 -mindepth 1 -type d -not -name 'template' -printf '%f\n' | sort)
enabled_plugins=$(find -L "$enabled_plugins_dir" -maxdepth 1 -mindepth 1 -type d -printf '%f\n' | sort)
disabled_plugins=$(printf "%s\n" $available_plugins $enabled_plugins_dir | sort | uniq -u)

# operation defaults
read_only=true
quiet=false

# initialization
if [ -w "$enabled_plugins_dir" ]; then
  read_only=false
fi

_list() {
  for plugin in $available_plugins; do
    echo "$plugin"
  done
}

_status() {
  for plugin in $available_plugins; do
    if [ -h "$enabled_plugins_dir/$plugin" ]; then
      status="*"
    else
      status=" "
    fi
    echo "[$status] $plugin"
  done
}

_usage() {
  echo "$program_name: manages Noosfero plugins system-wide"
  echo
  echo "Usage:"
  echo "  $program_name [OPTIONS] list"
  echo "  $program_name [OPTIONS] status"
  echo "  $program_name [OPTIONS] enable PLUGIN [PLUGIN ...]"
  echo "  $program_name [OPTIONS] disable PLUGIN [PLUGIN ...]"
  echo "  $program_name [OPTIONS] enableall"
  echo "  $program_name [OPTIONS] disableall"
  echo "  $program_name [OPTIONS] new PLUGIN [PLUGIN ...]"
  echo
  echo "Options:"
  echo "  --quiet|-q"
  echo "    Run quietly"
  echo "  --version|-v"
  echo "    Prints version information and exits"
  echo
}

_say(){
  if [ "$quiet" = 'false' ]; then
    echo $@
  fi
}

_enable(){
  plugin="$1"
  source="$available_plugins_dir/$plugin"
  target="$enabled_plugins_dir/$plugin"
  if [ -h "$target" ]; then
    _say "$plugin already enabled"
  else
    ln -s "$source" "$target"
    plugins_public_dir="$NOOSFERO_DIR/public/plugins"
    test -d "$target/public/" && ln -s "$target/public" "$plugins_public_dir/$plugin"
    _say "$plugin enabled"
  fi
}

_disable(){
  plugin="$1"
  target="$enabled_plugins_dir/$plugin"
  plugins_public_dir="$NOOSFERO_DIR/public/plugins"
  if [ -h "$target" ]; then
    rm "$target"
    test -h "$plugins_public_dir/$plugin" && rm "$plugins_public_dir/$plugin"
    _say "$plugin disabled"
  else
    _say "$plugin already disabled"
  fi
}

_new(){
  plugin=$(echo "$1" | tr '[:upper:]' '[:lower:]')
  target="$available_plugins_dir/$plugin"
  if [ -d "$target" ]; then
    _say "There is already a plugin called $plugin"
    exit 1
  else
    template="$available_plugins_dir/template"
    mkdir "$target"

    plugin_name=$(echo "$plugin" | sed -e 's/^./\u&/; s/_\(.\)/\u\1/')
    for source_file in $(find "$template" -type f); do
      target_file=$(echo "$source_file" | sed -e "s/template/$plugin/g")
      mkdir -p $(dirname "$target_file")
      sed "s/TemplatePlugin/${plugin_name}Plugin/g" "$source_file" > "$target_file"
    done
    _enable "$plugin"
  fi
}

_enableall(){
  for plugin in $available_plugins; do
    _enable "$plugin"
  done
}

_disableall() {
  for plugin in $enabled_plugins; do
    _disable "$plugin"
  done
}

if [ $# -eq 0 ]; then
  _usage
  exit 0
fi

while [ ! -z "$1" ] && [ "${1##-}" != "$1" ]; do
  opt="$1"
  shift
  case "$opt" in
    -q|--quiet)
      quiet=true
      ;;
    -v|--version)
      ruby "-I$NOOSFERO_DIR/lib" -rnoosfero -e "puts \"$program_name version #{Noosfero::VERSION}\""
      exit 0
      ;;
    *)
      echo "Unknown option: $opt"
      _usage
      exit 1
      ;;
  esac
done

command="$1"
if [ -z "$command" ]; then
  _usage
  exit 1
fi
shift
case "$command" in
  list|status|usage|enableall|disableall)
    if [ ! -z "$1" ]; then
      _usage
      exit 1
    fi
    _$command
    exit 0
    ;;
  enable|disable|new)
    for plugin in $@; do
      _$command "$plugin"
    done
    exit 0
    ;;
  *)
    echo "Unknown command: $command"
    _usage
    exit 1
    ;;
esac